CN108491599A - A kind of mixed type filler swelling property evaluation method for railway bed - Google Patents
A kind of mixed type filler swelling property evaluation method for railway bed Download PDFInfo
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Abstract
本发明公开了一种用于铁路路基的混合型填料膨胀性评价方法，该方法具备如下步骤：构建混合料膨胀率计算模型，基于混合料膨胀率计算模型得到当前路段混合型填料的膨胀率，再根据铁路路基所属地域的膨胀影响深度，进一步计算出该路段的膨胀评价高度；将膨胀评价高度与预设的标准膨胀量进行比较，若超过则调整一个或多个影响膨胀评价高度的参数，直至膨胀评价高度小于标准膨胀量。本发明提高了混合型填料膨胀性评价的完整性和准确性，为高速轨道交通的填料工程提供了膨胀性调整方案，并为其实施提供了具体地指导意义。
The invention discloses a method for evaluating the expansibility of a mixed filler used in a railway subgrade. The method comprises the following steps: constructing a calculation model for the expansion rate of the mixture, and obtaining the expansion rate of the mixed filler in the current road section based on the calculation model for the expansion rate of the mixture. Further calculate the expansion evaluation height of the road section according to the expansion influence depth of the area to which the railway subgrade belongs; compare the expansion evaluation height with the preset standard expansion amount, if it exceeds, adjust one or more parameters that affect the expansion evaluation height, Until the expansion evaluation height is less than the standard expansion. The invention improves the completeness and accuracy of the evaluation of the expansibility of the hybrid filler, provides an expansion adjustment scheme for the filler engineering of high-speed rail transit, and provides specific guiding significance for its implementation.
Description
技术领域technical field
本发明涉及铁路路基填料领域，具体地说，是涉及一种用于铁路路基的混合型填料膨胀性评价方法。The invention relates to the field of railway roadbed fillers, in particular to a method for evaluating the expansibility of mixed fillers used in railway roadbeds.
背景技术Background technique
在铁路运输领域，路基的微小形变会对线路的平稳性产生巨大的影响。尤其是严寒地区、炎热地区和极端天气地区，其路基的膨胀变形严重影响列车的舒适度以及道路结构的耐用性和持久性，是保障列车行驶安全的基础性工程。因此，研究路基填筑材料的膨胀性问题对于经常性极端天气地区的铁路建设及维护具有重要的意义。In the field of railway transportation, the slight deformation of the roadbed will have a huge impact on the stability of the line. Especially in severe cold areas, hot areas and extreme weather areas, the expansion and deformation of the roadbed seriously affect the comfort of the train and the durability and durability of the road structure, which is a basic project to ensure the safety of trains. Therefore, it is of great significance to study the expansion of subgrade filling materials for the construction and maintenance of railways in frequent extreme weather areas.
在普通铁路特别是高速铁路领域中，路基填筑材料具有更高的稳定性要求，一方面，在列车荷载的作用、以及轨道与路基结构的自重荷载作用下仍能保持稳定，还需要满足其力学特性不易受水、温度、施工压力、列车荷载、地震等外力作用的影响。通常，路基填筑材料采用混合型填料，其主要由粗颗粒骨架、骨架中的填充料以及剩余孔隙组成，一般的，填充料中含有的细颗粒填料遇水会发生膨胀，随着细颗粒填充料体积增大，在宏观上则体现为混合型填料(混合料)的膨胀过程。In the field of ordinary railways, especially high-speed railways, subgrade filling materials have higher stability requirements. The mechanical properties are not easily affected by external forces such as water, temperature, construction pressure, train load, and earthquakes. Usually, roadbed filling materials use mixed fillers, which are mainly composed of coarse-grained skeletons, fillers in the skeletons, and remaining pores. Generally, the fine-grained fillers contained in the fillers will expand when exposed to water. The volume of the material increases, and it is reflected in the expansion process of the mixed filler (mixture) macroscopically.
通常，辨别填料土的膨胀性分类是膨胀评价的前提。在现有技术中，有些采用膨胀量等级进行评价，有些将计算出的膨胀率作为评价依据。由于土体膨胀的影响因素多样，对水和气候条件十分敏感，土体膨胀既与通过现场测量或计算出的膨胀高度有关，又与反映土体相对膨胀量的膨胀率有关，使得对膨胀性的评价存在如下问题：若膨胀率一定时，因其与膨胀高度有关，该地区的土体可能判断为弱膨胀土等级，但实际上其膨胀形变量超过标准值，会对线路平稳性产生很大影响；对评价为强膨胀土等级的地区，若膨胀高度较小其膨胀形变不会对影响线路的整体平稳性。因此，在评价膨胀性时，若仅考虑单一影响因素则无法全面反映填料的真实膨胀情况。另外，针对膨胀性评价后的调整方法也少有涉及。Usually, distinguishing the expansion classification of filling soil is the premise of expansion evaluation. In the prior art, some grades of expansion are used for evaluation, and some use the calculated expansion rate as the evaluation basis. Due to various influencing factors of soil swelling, which are very sensitive to water and climatic conditions, soil swelling is not only related to the swelling height measured or calculated on site, but also related to the swelling rate reflecting the relative swelling of the soil. The following problems exist in the evaluation of the expansion rate: if the expansion rate is constant, the soil in this area may be judged as a weak expansive soil grade because it is related to the expansion height, but in fact its expansion deformation exceeds the standard value, which will have a great impact on the stability of the line. Great impact; for areas evaluated as strong expansive soil grades, if the expansion height is small, the expansion deformation will not affect the overall stability of the line. Therefore, when evaluating the expansion property, if only a single influencing factor is considered, it cannot fully reflect the real expansion of the filler. In addition, the adjustment method after the expansion evaluation is rarely involved.
发明内容Contents of the invention
为了解决上述技术问题，本发明提供了一种用于铁路路基的混合型填料膨胀性评价方法，该方法具备如下步骤：膨胀高度计算步骤，构建混合料膨胀率计算模型，基于所述混合料膨胀率计算模型得到当前路段混合型填料的膨胀率，再根据铁路路基所属地域的膨胀影响深度，进一步计算出该路段的膨胀评价高度；膨胀高度评价步骤，将所述膨胀评价高度与预设的标准膨胀量进行比较，若超过则调整一个或多个影响所述膨胀评价高度的参数，直至所述膨胀评价高度小于所述标准膨胀量。In order to solve the above-mentioned technical problems, the present invention provides a method for evaluating the expansibility of mixed fillers used in railway subgrades. The method has the following steps: the step of calculating the expansion height, constructing a calculation model for the expansion rate of the mixture, and based on the expansion of the mixture, The rate calculation model obtains the expansion rate of the mixed filler in the current road section, and then further calculates the expansion evaluation height of the road section according to the expansion influence depth of the area where the railway subgrade belongs; the expansion height evaluation step compares the expansion evaluation height with the preset standard The expansion amount is compared, and if it exceeds, one or more parameters affecting the expansion evaluation height are adjusted until the expansion evaluation height is less than the standard expansion amount.
优选地，在所述膨胀高度计算步骤中，基于混合型填料冻胀预测模型，根据混合型填料在膨胀过程中的竖向膨胀系数、压实后的反弹系数、及导湿系数，并结合铁路路基所属地域的蒸发率，建立混合料膨胀率计算模型。Preferably, in the step of calculating the expansion height, based on the mixed-type filler frost heave prediction model, according to the vertical expansion coefficient of the mixed-type filler during the expansion process, the rebound coefficient after compaction, and the moisture conductivity coefficient, combined with the railway Based on the evaporation rate of the area where the subgrade belongs, a calculation model for the expansion rate of the mixture is established.
优选地，在所述膨胀高度评价步骤中，所述膨胀评价高度的影响参数包括混合型填料压实后的反弹系数、细颗粒填充料含量、混合型填料含水率、混合型填料密度、以及所述膨胀影响深度。Preferably, in the step of evaluating the expansion height, the parameters affecting the evaluation height of the expansion include the rebound coefficient of the mixed filler after compaction, the content of the fine particle filler, the moisture content of the mixed filler, the density of the mixed filler, and the The expansion affects the depth described above.
优选地，所述膨胀高度评价步骤进一步包括，当所述膨胀评价高度超过所述标准膨胀量时，利用预设的膨胀性等级模型，确定混合型填料的膨胀性评价等级，所述膨胀评价等级包括极弱微膨胀、弱微膨胀、中下微膨胀、中上微膨胀、强微膨胀和极强微膨胀；根据当前所述膨胀性评价等级，利用预设的膨胀性调节机制，对影响当前路段混合型填料膨胀性的主要因素进行调整，使得所述膨胀评价高度低于所述标准膨胀量。Preferably, the expansion height evaluation step further includes, when the expansion evaluation height exceeds the standard expansion amount, using a preset expansion level model to determine the expansion evaluation level of the mixed filler, the expansion evaluation level Including extremely weak micro-expansion, weak micro-expansion, middle-lower micro-expansion, middle-upper micro-expansion, strong micro-expansion and very strong micro-expansion; The main factor of the expansion of the mixed filler in the road section is adjusted so that the expansion evaluation height is lower than the standard expansion amount.
优选地，在确定混合型填料的膨胀性评价等级步骤中，进一步包括，确定各膨胀性评价等级内混合料膨胀率的范围；若当前路段的所述混合料膨胀率满足对应所述膨胀性评价等级内所述混合料膨胀率的范围，则将该等级作为评价当前铁路路基膨胀性的等级。Preferably, in the step of determining the expansion evaluation grade of the hybrid filler, it further includes determining the range of the expansion ratio of the mixture in each expansion evaluation grade; if the expansion ratio of the mixture in the current road section meets the corresponding expansion evaluation The range of the expansion rate of the mixture in the grade is used as the grade to evaluate the expansion of the current railway subgrade.
优选地，在根据当前所述膨胀性评价等级，利用预设的膨胀性调节机制，对影响当前路段混合型填料膨胀性的主要因素进行调整步骤中，当所述膨胀性评价等级为极弱微膨胀或弱微膨胀时，调整膨胀评价高度影响参数中的所述膨胀影响深度。Preferably, in the step of adjusting the main factors affecting the expansibility of the hybrid filler in the current road section using the preset expansion adjustment mechanism according to the current expansion evaluation level, when the expansion evaluation level is extremely weak In the case of expansion or weak expansion, adjust the expansion influence depth in the expansion evaluation height influence parameter.
优选地，在根据当前所述膨胀性评价等级，利用预设的膨胀性调节机制，对影响当前路段混合型填料膨胀性的主要因素进行调整步骤中，当所述膨胀性评价等级为中下微膨胀或中上微膨胀时，调整膨胀评价高度影响参数中的所述膨胀影响深度，或者选取任意个包括混合料压实后的反弹系数、细颗粒填充料含量、混合型填料含水率和混合型填料密度的混合料膨胀率影响参数进行调整。Preferably, in the step of adjusting the main factors affecting the expansibility of the hybrid filler in the current road section according to the current expansibility evaluation grade and using the preset expansibility adjustment mechanism, when the expansibility evaluation grade is middle-lower-micro In the case of expansion or middle-upper micro-expansion, adjust the expansion influence depth in the expansion evaluation height influence parameter, or select any one including the rebound coefficient after compaction of the mixture, the content of fine particle filler, the moisture content of the mixed type filler and the mixed type The parameters that affect the filler density to the expansion rate of the mixture are adjusted.
优选地，在根据当前所述膨胀性评价等级，利用预设的膨胀性调节机制，对影响当前路段混合型填料膨胀性的主要因素进行调整步骤中，当所述膨胀性评价等级为强微膨胀或极强微膨胀时，进一步完善如下一种或多种措施：基床隔水措施、基床保温措施和基床抗形变措施。Preferably, in the step of adjusting the main factors affecting the expansibility of the hybrid filler in the current road section by using the preset expansion adjustment mechanism according to the current expansion evaluation level, when the expansion evaluation level is strong micro-expansion Or when there is extremely strong micro-expansion, further improve one or more of the following measures: water-proof measures for the foundation bed, insulation measures for the foundation bed, and anti-deformation measures for the foundation bed.
优选地，在所述膨胀高度计算步骤中，利用如下表达式表示所述混合料膨胀率计算模型：Preferably, in the step of calculating the expansion height, the following expression is used to represent the calculation model of the mixture expansion rate:
其中，η混表示混合型填料膨胀率，f表示混合型填料压实后的反弹系数，k表示混合型填料的导湿系数，υ表示混合型填料的蒸发率，表示混合型填料膨胀时的竖向膨胀系数，ρ混表示混合型填料密度，θ表示细颗粒填充料含量，ds表示混合型填料与水的重量之比，α表示填充料冻胀率，β表示混合型填料的填充率，β0表示混合型填料的初始填充率，ρw表示水的密度，w表示混合型填料含水率，G骨架表示骨架中的粗颗粒占混合型填料的重量比例。Among them, η mix indicates the expansion rate of mixed filler, f indicates the rebound coefficient of mixed filler after compaction, k indicates the moisture conductivity of mixed filler, and υ indicates the evaporation rate of mixed filler, Indicates the vertical expansion coefficient when the mixed filler expands, ρ mix indicates the density of the mixed filler, θ indicates the content of the fine particle filler, d s indicates the weight ratio of the mixed filler to water, α represents the frost heaving rate of the filler, β represents the filling rate of the mixed filler, β 0 represents the initial filling rate of the mixed filler, ρw represents the density of water, w represents the water content of the mixed filler, and the G skeleton represents the coarse Particles account for the weight ratio of mixed fillers.
优选地，在调整膨胀评价高度影响参数中的所述膨胀影响深度步骤中，将所述标准膨胀量作为当前所述膨胀评价高度，根据当前已计算出的所述混合料膨胀率，得到对应的膨胀影响深度的标准值，并将该标准值作为更新后的所述膨胀影响深度。Preferably, in the step of adjusting the expansion influence depth in the expansion evaluation height influence parameter, the standard expansion amount is used as the current expansion evaluation height, and the corresponding expansion ratio is obtained according to the currently calculated expansion rate of the mixture. A standard value of the expansion influence depth is used as the updated expansion influence depth.
与现有技术相比，上述方案中的一个或多个实施例可以具有如下优点或有益效果：Compared with the prior art, one or more embodiments in the above solutions may have the following advantages or beneficial effects:
本发明对混合料膨胀率计算模型进行了修正，提高了土体膨胀性评价的全面性，在评价膨胀评价高度参数时将修正后的膨胀率进行结合，完善膨胀性的评价参考因素，精细划分了土体填料的膨胀等级，为高速轨道交通的填料工程提供一种新的评价膨胀性的方法。The present invention corrects the calculation model of the expansion rate of the mixture, improves the comprehensiveness of soil expansibility evaluation, combines the corrected expansion rate when evaluating the expansion evaluation height parameter, improves the expansibility evaluation reference factors, and finely divides The expansion grade of soil filler is determined, and a new method of evaluating expansion is provided for the filling engineering of high-speed rail transit.
本发明的其他优点、目标，和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书，权利要求书，以及附图中所特别指出的结构来实现和获得。Other advantages, objects, and features of the present invention will be set forth in the ensuing description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be Learn from the practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
附图说明Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例共同用于解释本发明，并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:
图1为本申请实施例的用于铁路路基的混合型填料膨胀性评价方法的步骤流程图。Fig. 1 is a flow chart of the steps of the method for evaluating the expansibility of hybrid fillers for railway subgrades according to an embodiment of the present application.
具体实施方式Detailed ways
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
本发明实施例旨在形成一种用于铁路路基的混合型填料膨胀性评价方法，该方法将基于现有冻胀预测模型进行修正，得到了混合料膨胀率计算模型，通过该模型计算当前路段的填料工程后的膨胀率，再利用膨胀高度评价公式以及膨胀率等级模型，建立针对膨胀型变量的评估方法，实现了对混合型填料膨胀性的完整评价。The embodiment of the present invention aims to form a method for evaluating the expansibility of mixed fillers for railway subgrades. This method will be corrected based on the existing frost heaving prediction model, and a calculation model for the expansion rate of the mixture is obtained. The current road section is calculated by this model. Based on the expansion rate after the filler engineering, the evaluation method for the expansion variable is established by using the expansion height evaluation formula and the expansion rate grade model, and a complete evaluation of the expansion of the mixed filler is realized.
图1为本申请实施例的用于铁路路基的混合型填料膨胀性评价方法的步骤流程图。如图1所示，在步骤S110中(膨胀高度计算步骤)，构建混合料膨胀率计算模型，基于混合料膨胀率计算模型得到当前路段混合型填料的膨胀率，再根据铁路路基所属地域属性得到的膨胀影响深度，计算出该路段的膨胀评价高度。其中，需要将混合料膨胀率与膨胀影响深度作乘法运算(膨胀高度评价计算公式)，从而得到能够评价混合型填料膨胀性的核心参数——膨胀评价高度。Fig. 1 is a flow chart of the steps of the method for evaluating the expansibility of hybrid fillers for railway subgrades according to an embodiment of the present application. As shown in Figure 1, in step S110 (the expansion height calculation step), a calculation model for the expansion rate of the mixture is constructed, based on the calculation model for the expansion rate of the mixture, the expansion rate of the mixed filler in the current road section is obtained, and then obtained according to the regional attribute of the railway subgrade Calculate the expansion evaluation height of the road section. Among them, it is necessary to multiply the expansion rate of the mixture and the expansion influence depth (expansion height evaluation calculation formula), so as to obtain the core parameter that can evaluate the expansion of the mixed filler—the expansion evaluation height.
具体地，在该步骤S110中，基于现有的混合型填料冻胀预测模型，根据混合型填料在膨胀过程中的竖向膨胀系数、混合型填料压实后的反弹系数、及混合型填料的导湿系数，并参考铁路路基所属地域的蒸发率，进一步建立混合料膨胀率计算模型。下面先对混合型填料冻胀预测模型的构建过程进行说明。Specifically, in this step S110, based on the existing mixed-type filler frost heave prediction model, according to the vertical expansion coefficient of the mixed-type filler during the expansion process, the rebound coefficient of the mixed-type filler after compaction, and the The coefficient of moisture conductivity, and referring to the evaporation rate of the area where the railway subgrade belongs, further establishes a calculation model for the expansion rate of the mixture. The construction process of the mixed filler frost heave prediction model will be described below.
首先，在混合型填料冻胀过程的完全填充情况中，由于土体中的剩余孔隙率直接决定着内部对冻胀的消解能力，当填充料在低温状态下发生冻胀时，若首先填满剩余孔隙，然后才促使混合料的宏观膨胀，那么，此时的宏观冻胀为其最小状态。其中的冻胀过程实际是混合型填料中细颗粒填充料，混合型填料中的粗颗粒不胀，而且粗颗粒亦是刚体，但细颗粒低温冻胀。此处细颗粒填充料的组分体积为土颗粒和水分，填充料和剩余孔隙组成了混合型填料的骨架孔隙，细颗粒冻胀时，一部分水迁移出去，此时假设填充料颗粒直接膨胀来模拟实际情况填充料颗粒吸附水分子膨胀，从而研究混合型填料完全填充的情况。对于混合型填料完全填充模型，有理论关系式：△V混合型填料＝△V填充料-(V骨架孔隙-V填充料)，其中，△V混合型填料表示混合型填料整体冻胀后的体积变化量，△V填充料表示填充料颗粒冻胀后的体积变化量，V骨架孔隙表示骨架孔隙的体积，V填充料表示填充料颗粒的体积，基于此，在经过取样后的室内实验，依据混合料冻胀过程中填充料冻胀与骨架颗粒间相互作用关系推导出混合型填料冻胀预测模型。该模型描述了混合型填料的宏观膨胀与混合型填料密度、填充料含量、填充料膨胀率、混合型填料比重、水的密度、混合型填料含水率以及骨架中的粗颗粒占混合型填料的重量比例(骨架比重)有密切的关系，实际的冻胀率会高于该值。能够利用如下表达式表示该模型：First of all, in the case of complete filling in the process of frost heaving of mixed fillers, since the remaining porosity in the soil directly determines the internal ability to dissipate frost heaves, when the fillers experience frost heaving at low temperature, if the filler is filled first The remaining pores will then promote the macroscopic expansion of the mixture, then the macroscopic frost heave at this time is at its minimum state. The frost heaving process is actually the fine particle filler in the mixed filler. The coarse particles in the mixed filler do not expand, and the coarse particles are also rigid bodies, but the fine particles freeze heaving at low temperature. Here, the component volume of the fine-grained filler is soil particles and water, and the filler and the remaining pores constitute the skeleton pores of the hybrid filler. When the fine particles freeze heaving, part of the water migrates out. At this time, it is assumed that the filler particles are directly expanded. Simulate the expansion of filler particles adsorbing water molecules in the actual situation, so as to study the complete filling of hybrid fillers. For the complete filling model of mixed filler, there is a theoretical relationship: △V mixed filler = △V filler - (V skeleton pore - V filler ), where △V mixed filler represents the overall frost heave of the mixed filler Volume change, △V filler means the volume change of filler particles after frost heaving, V skeleton pores means the volume of skeleton pores, and V filler means the volume of filler particles. Based on this, in the laboratory experiment after sampling, According to the interaction relationship between the frost heave of the filler and the skeleton particles during the frost heave process of the mixture, the prediction model of the frost heave of the mixed filler is derived. The model describes the macroscopic expansion of the mixed filler and the density of the mixed filler, the content of the filler, the expansion rate of the filler, the specific gravity of the mixed filler, the density of water, the moisture content of the mixed filler, and the proportion of the coarse particles in the skeleton to the mixed filler. The weight ratio (skeleton specific gravity) is closely related, and the actual frost heaving rate will be higher than this value. The model can be represented by the following expression:
ξ混(初)＝ξ(ρ混，θ，α，ds，ρω，w，G骨架)ξmix (primary) = ξ( ρmix , θ, α, d s , ρ ω , w, G skeleton )
其中，ξ混(初)表示在完全填充情况下混合型填料的冻胀率，ρ混表示混合型填料密度，θ表示细颗粒填充料含量，α表示填充料冻胀率，ds表示混合型填料与水的重量比重(混合型填料比重，具体地，指混合型填料重量与同体积4℃时水的重量之比值)，ρw表示水的密度，w表示混合型填料含水率，G骨架表示骨架中的粗颗粒占混合型填料的重量比例(骨架比重)。Among them, ξmixed (initial) indicates the frost heaving rate of mixed filler under the condition of complete filling, ρmixed indicates the density of mixed filler, θ indicates the content of fine particle filler, α indicates the frost heaving rate of filler, and d s indicates the mixed filler The weight specific gravity of filler and water (the specific gravity of mixed filler, specifically, refers to the ratio of the weight of mixed filler to the weight of water at the same volume at 4°C), ρ w represents the density of water, w represents the water content of mixed filler, G skeleton Indicates the weight ratio of coarse particles in the skeleton to the mixed filler (skeleton specific gravity).
然后，需要对混合型填料冻胀过程的不完全填充情况进行分析。工程中使用的混合型填料中的填充料在低温下含水的填充料细颗粒会发生冻胀，随着填充料体积增大，并非膨胀体积占满剩余孔隙再抬升混合型填料的骨架。实际上，在冻胀发生时，填充料未完全充填骨架剩余孔隙遇到的阻力即可促使其抬升骨架，在宏观上体现为混合型填料的冻胀过程。此时，△V填充料＝△V混合型填料+△V挤出，其中，△V挤出表示填充料在膨胀过程中有一部分填料被挤入相邻孔隙中的体积。进一步，若建立混合料冻胀不完全填充物理流变模型，需要用填充率表示充填程度，定义为填充料体积与骨架孔隙体积的比值，即β＝△V充填料/V骨架孔隙，在利用能量守恒原理及数学关系求解模型，推导出填充率关系式其中，β表示不完全填充程度(混合型填料的填充率)，N表示上覆荷载，C表示填充料粘聚力，表示细颗粒摩擦角，β0表示混合型填料的初始填充率。因此，填充率参数与上覆荷载、填充冻胀率、填充料粘聚力、细颗粒摩擦角、初始填充率参数有密切关系。Then, it is necessary to analyze the incomplete filling of the mixed filler in the process of frost heave. The filler in the mixed filler used in the project will freeze heave when the fine particles of the filler contain water at low temperature. As the volume of the filler increases, it is not the expansion volume that fills the remaining pores and then lifts the skeleton of the mixed filler. In fact, when frost heave occurs, the resistance encountered by fillers that do not completely fill the remaining pores of the skeleton can prompt it to lift the skeleton, which is reflected in the frost heave process of mixed fillers on a macroscopic level. At this time, △V filler = △V mixed filler + △V extrusion , where △V extrusion indicates the volume of a part of the filler that is squeezed into the adjacent pores during the expansion process of the filler. Furthermore, if the physical rheological model of the incomplete filling of the mixture due to frost heaving is established, the filling rate needs to be used to represent the filling degree, which is defined as the ratio of the filler volume to the skeleton pore volume, that is, β=△V filling material /V skeleton pore , when using The principle of energy conservation and the mathematical relationship solution model, deduce the filling rate relationship Among them, β represents the degree of incomplete filling (filling rate of mixed filler), N represents the overlying load, C represents the cohesion of the filler, Indicates the friction angle of fine particles, and β0 indicates the initial filling rate of mixed fillers. Therefore, the filling rate parameters are closely related to the overlying load, filling frost heave rate, filler cohesion, fine particle friction angle, and initial filling rate parameters.
最后，将基于现有的结合混合型填料完全填充理论模型与不完全理论模型，即考虑到完全充填和抬升作用的相互影响，基于能量最低原理，推导出了混合型填料冻胀预测模型。该模型与上覆荷载、填充料塑性变形摩擦角、填充料粘聚力、填充料冻胀率、混合料初始填充料填充骨架孔隙程度(不完全填充程度)、混合型填料比重、水的密度、混合型填料含水率、混合型填料密度、细颗粒填充料含量以及骨架比重均有密切的关系，并利用表达式表示：Finally, based on the existing theoretical model of complete filling of mixed filling and incomplete theoretical model, that is, considering the interaction between full filling and uplifting, and based on the principle of minimum energy, a prediction model for frost heaving of mixed filling is derived. The model is related to the overlying load, the plastic deformation friction angle of the filler, the cohesive force of the filler, the frost heave rate of the filler, the degree to which the initial filler of the mixture fills the skeleton pores (incomplete filling degree), the specific gravity of the mixed filler, and the density of water. , mixed filler moisture content, mixed filler density, fine particle filler content and skeleton specific gravity are all closely related, and expressed by the expression:
其中，ξ混表示混合型填料的冻胀率。Among them, ξmixed represents the frost heave rate of mixed filler.
在得到了混合型填料冻胀预测模型后，对该模型进行优化，由于相对于冻胀过程而言，混合型填料的膨胀过程没有了低温状态的限制，与原有冻胀模型相比考虑了混合型填料的导湿性、膨胀时填料的侧向收缩性、弹性形变及蒸发效果的影响，扩大了原有模型的适用范围。具体地，第一，混合型填料压实后的反弹系数与混合型填料的自身性质有关，可通过压实实验测得。在填料填充压实后，部分混合料处于弹性形变状态，在载荷移除或减小后弹性变形会产生反弹或恢复，造成体积膨胀，在计算整体膨胀率时，需要考虑这一参数的影响。第二，由于毛细作用的存在，水分会由下向上传导，不同的填料导水能力有所不同，持水能力也不相同，所以需要在原有冻胀过程的基础上对含水率乘以导湿系数，导湿系数可通过室内饱和试验测得。第三，由于路基沿线气候环境不同，其地表蒸发效应也不相同，实际含水率应小于室内含水率，所以在原有冻胀模型上应减去蒸发率，不同地区蒸发率可通过当地气象部门公布资料或实测获得。第四，在混合型填料膨胀时，由于受到上覆载荷作用的影响，除了竖向膨胀外，而且会向侧向膨胀变形，即竖向膨胀量应小于理论计算值，所以在原有冻胀模型基础上还需考虑到竖向膨胀系数，竖向膨胀系数可通过室内膨胀试验测得。因此，可利用如下表达式表示混合料膨胀率计算模型：After getting the frost heave prediction model of the mixed type filler, the model is optimized. Compared with the frost heave process, the expansion process of the mixed type filler is not limited by the low temperature state, and compared with the original frost heave model, it takes into account The influence of the moisture conductivity of the mixed filler, the lateral shrinkage of the filler during expansion, the elastic deformation and the evaporation effect expands the scope of application of the original model. Specifically, first, the rebound coefficient of the mixed filler after compaction is related to the properties of the mixed filler, which can be measured through compaction experiments. After the filler is filled and compacted, part of the mixture is in a state of elastic deformation. After the load is removed or reduced, the elastic deformation will rebound or recover, resulting in volume expansion. When calculating the overall expansion rate, the influence of this parameter needs to be considered. Second, due to the existence of capillary action, moisture will be conducted from bottom to top. Different fillers have different water conductivity and water holding capacity. Therefore, it is necessary to multiply the moisture content by the moisture conductivity on the basis of the original frost heave process. Coefficient, moisture conductivity can be measured by indoor saturation test. Third, due to the different climate and environment along the roadbed, the surface evaporation effect is also different. The actual moisture content should be less than the indoor moisture content. Therefore, the evaporation rate should be subtracted from the original frost heaving model. The evaporation rate in different regions can be announced by the local meteorological department obtained from data or measurements. Fourth, when the mixed-type filler expands, due to the influence of the overlying load, in addition to vertical expansion, it will also expand and deform laterally, that is, the vertical expansion should be less than the theoretical calculation value, so in the original frost heave model On the basis of this, the vertical expansion coefficient needs to be considered, which can be measured by indoor expansion test. Therefore, the following expression can be used to express the calculation model of the mixture expansion rate:
进一步表示为：Further expressed as:
其中，η混表示混合型填料膨胀率，f表示混合型填料压实后的反弹系数，k表示混合型填料的导湿系数，υ表示混合型填料的蒸发率，表示混合型填料膨胀时的竖向膨胀系数，从而完成了混合料膨胀率计算模型的建立。需要说明的是，由于该模型没有了对混合型填料冻胀预测模型的低温限制，故参数α则变更为表示填充料膨胀率。混合料膨胀率计算模型不仅与混合型填料冻胀预测模型中的影响参数有关，还与混合型填料的导湿系数、膨胀过程中的竖向膨胀系数、压实后的反弹系数，以及当前铁路路基所属地域的蒸发率有关。Among them, η mix indicates the expansion rate of mixed filler, f indicates the rebound coefficient of mixed filler after compaction, k indicates the moisture conductivity of mixed filler, and υ indicates the evaporation rate of mixed filler, Indicates the vertical expansion coefficient when the mixed filler expands, thus completing the establishment of the calculation model for the expansion rate of the mixture. It should be noted that, since the model does not have the low temperature limit for the mixed filler frost heave prediction model, the parameter α is changed to represent the filler expansion rate. The calculation model of the mixture expansion rate is not only related to the influencing parameters in the frost heave prediction model of the mixed filler, but also related to the moisture conductivity of the mixed filler, the vertical expansion coefficient during the expansion process, the rebound coefficient after compaction, and the current railway It is related to the evaporation rate of the area where the subgrade belongs.
再次参考图1，在计算评价混合型填料膨胀性的膨胀评价高度时，其中的膨胀影响深度参数与铁路路基所属地域的气候、土体湿度、上载荷载、土体土质等因素有关，可以通过《铁路路基设计规范》查到。另外，各地区土体的膨胀影响深度参数还可通过实际测量或当地气象、地质部门了解得到。在实际工程中，若需要对膨胀影响深度参数进行调节，具体地，可以利用基床结构的实际填筑高度或者采取保温措施来调节这一参数。下述表1中的0.4m，0.7m，1.5m，2m，2.5m，3m就是基床结构各层高度的逐层累积之和，最大达到3m，也就是说无论外界环境中的膨胀影响深度数值有多大，其对整体膨胀性的影响最大可以达到3m。Referring to Figure 1 again, when calculating the expansion evaluation height for evaluating the expansion of mixed fillers, the expansion influence depth parameter is related to the climate, soil humidity, upper load, soil quality and other factors in the area where the railway subgrade belongs. Code for Design of Railway Subgrade. In addition, the depth parameters affected by the expansion of soil in various regions can also be obtained through actual measurement or local meteorological and geological departments. In actual engineering, if it is necessary to adjust the parameter of the depth affected by expansion, specifically, the actual filling height of the foundation bed structure or thermal insulation measures can be used to adjust this parameter. The 0.4m, 0.7m, 1.5m, 2m, 2.5m, 3m in the following table 1 are the cumulative sum of the heights of each layer of the foundation bed structure, and the maximum reaches 3m, that is to say, regardless of the depth of expansion in the external environment How big the value is, its influence on the overall expansibility can reach up to 3m.
接着，根据现有铁路路基填料膨胀分类方案，确定混合型填料的标准膨胀量，在本例中，将从《高速铁路设计规范》中规定的足以影响到铁路安全运行的膨胀高度下限值4mm作为标准膨胀量，本申请对该参数不作具体限定。在实际应用过程中，维修线路的正线到发站线路两股钢轨水平面为实际的膨胀高度，即膨胀评价高度(该参数利用膨胀高度评价计算公式得到)，该值不得大于上述标准膨胀量。下面利用如下公式表示膨胀评价高度：Next, according to the existing railway subgrade filler expansion classification scheme, determine the standard expansion of the mixed filler. In this example, the lower limit of the expansion height 4mm that is sufficient to affect the safe operation of the railway specified in the "High-speed Railway Design Code" As a standard expansion amount, the present application does not specifically limit this parameter. In the actual application process, the horizontal plane of the two rails from the main line of the maintenance line to the station line is the actual expansion height, that is, the expansion evaluation height (this parameter is obtained by the calculation formula of the expansion height evaluation), and the value shall not be greater than the above-mentioned standard expansion amount. The following formula is used to express the expansion evaluation height:
△h＝η混·h△h=η mixed h
其中，△h表示膨胀评价高度，h表示膨胀影响深度。从上式中能够看出，构建膨胀率计算模型提高了混合型填料膨胀性的评价的完整性，使得影响膨胀率的工程参数也能够影响填料膨胀性的评价。因此，在对膨胀性进行调整时，既可以调整膨胀影响深度，还能够调整膨胀率影响因子。Among them, △h represents the height of expansion evaluation, and h represents the depth of expansion influence. It can be seen from the above formula that the construction of the expansion rate calculation model improves the integrity of the evaluation of the expansion of the mixed filler, so that the engineering parameters that affect the expansion rate can also affect the evaluation of the expansion of the filler. Therefore, when adjusting the expansibility, not only the depth of expansion influence can be adjusted, but also the factor affecting the expansion rate can be adjusted.
再次参考图1，当完成当前路段的膨胀评价高度后，进入到步骤S120中(膨胀高度评价步骤)。在该步骤S120中，将计算出的膨胀评价高度与预设的标准膨胀量进行比较，若超过则调整一个或多个影响膨胀评价高度的参数，直至膨胀评价高度小于标准膨胀量。其中，膨胀评价高度影响参数包括混合料压实后的反弹系数、细颗粒填充料含量、混合型填料含水率、混合型填料密度、以及膨胀影响深度。Referring again to FIG. 1 , after completing the evaluation height of the expansion of the current section, enter step S120 (the evaluation step of the expansion height). In the step S120, the calculated expansion evaluation height is compared with the preset standard expansion amount, and if it exceeds, one or more parameters affecting the expansion evaluation height are adjusted until the expansion evaluation height is less than the standard expansion amount. Among them, the parameters affecting the expansion evaluation height include the rebound coefficient of the mixture after compaction, the content of fine particle filler, the moisture content of the mixed filler, the density of the mixed filler, and the depth of expansion influence.
具体地，当膨胀评价高度超过标准膨胀量时，获取当前路段的混合料膨胀率与膨胀影响深度，利用预设的膨胀性等级模型，确定混合型填料的膨胀性评价等级。其中，膨胀评价等级包括极弱微膨胀(6级)、弱微膨胀(5级)、中下微膨胀(4级)、中上微膨胀(3级)、强微膨胀(2级)和极强微膨胀(1级)。需要说明的是，膨胀性等级模型既包括膨胀影响深度参数的等级，又包括混合料膨胀率的等级，其中，将这两个参数的经验范围值分别划分为相同级数的区间，每个区间的最大膨胀影响深度参数与最大混合料膨胀率的乘积满足小于上述标准膨胀量的原则。其中，表1为划分后的膨胀性等级模型的一个具体示例，本申请对膨胀性等级模型中每个参数的区间范围不作具体限定。Specifically, when the expansion evaluation height exceeds the standard expansion amount, the mixture expansion rate and expansion influence depth of the current road section are obtained, and the expansion evaluation level of the hybrid filler is determined using the preset expansion level model. Among them, the swelling evaluation grades include extremely weak micro swelling (level 6), weak micro swelling (level 5), middle and lower micro swelling (level 4), middle and upper micro swelling (level 3), strong micro swelling (level 2) and extremely Strong micro swelling (Grade 1). It should be noted that the expansibility grade model includes both the grade of the expansion influence depth parameter and the grade of the expansion rate of the mixture, where the empirical range values of these two parameters are divided into intervals of the same series, and each interval The product of the maximum expansion effect depth parameter and the maximum mixture expansion rate satisfies the principle that it is less than the above-mentioned standard expansion. Wherein, Table 1 is a specific example of the divided expansibility level model, and the present application does not specifically limit the interval range of each parameter in the expansibility level model.
表1膨胀性等级模型Table 1 Expansion grade model
综上所述，该膨胀性等级模型相较于传统仅考虑细颗粒含量和土体含水量的评价分类方案，增添了混合料压后反弹系数、细颗粒填充料含量、混合型填料含水率、混合型填料密度、以及膨胀影响深度等多个影响因素。In summary, compared with the traditional evaluation classification scheme that only considers the content of fine particles and soil water content, this expansibility grade model adds the rebound coefficient of the mixture after compression, the content of fine particle fillers, the moisture content of mixed fillers, There are many influencing factors such as the density of mixed fillers and the depth of expansion influence.
在上述确定混合型填料的膨胀性评价等级过程中，首先，需要按表1所示的等级分类形式，确定各个膨胀性评价等级内混合料膨胀率与膨胀影响深度的范围。然后，若获取到的当前路段的混合料膨胀率满足对应膨胀性评价等级内混合料膨胀率的范围，则将该等级作为当前铁路路基膨胀性的评价等级。In the above-mentioned process of determining the expansion evaluation grade of the mixed filler, first, it is necessary to determine the range of the expansion ratio and expansion influence depth of the mixture in each expansion evaluation grade according to the grade classification form shown in Table 1. Then, if the acquired mixture expansion rate of the current road section satisfies the range of the mixture expansion rate in the corresponding expansion evaluation grade, then this grade is used as the evaluation grade of the current railway subgrade expansibility.
接着，在确定完成膨胀性评价等级后，根据当前膨胀性评价等级，利用预设的已构建的膨胀性调节机制，对影响当前路段混合型填料膨胀性的主要因素分别进行调整，使得膨胀评价高度达到低于标准膨胀量的范围。Then, after confirming the completion of the expansibility evaluation grade, according to the current expansibility evaluation grade, using the preset expansibility adjustment mechanism, the main factors affecting the expansibility of the mixed filler in the current road section are adjusted respectively, so that the expansion evaluation height Achieving a range below the standard overrun.
(第一个示例)当计算出的当前混合料膨胀率为极弱微膨胀(6级)或弱微膨胀(5级)时，混合型填料自身的膨胀率较小，膨胀性评价等级则判断为极弱微膨胀(6级)或弱微膨胀(5级)，此时，可以调整膨胀评价高度影响参数中的膨胀影响深度参数。具体地，需要将上述标准膨胀量作为当前膨胀评价高度，根据当前计算出的混合料膨胀率，利用膨胀高度评价计算公式，反算出对应的膨胀影响深度的标准值，并将该标准值作为更新后的膨胀影响深度参数。进一步，根据更新后的膨胀影响深度值，调整实际工程基床结构的填筑高度，使得最终的膨胀评价高度小于标准膨胀量。另外，还可以实施减少外部大气与基床内部进行热交换的基床保温措施，实现对膨胀影响深度参数的控制。(First example) When the calculated expansion rate of the current mixture is extremely weak (level 6) or weak expansion (level 5), the expansion rate of the mixed filler itself is small, and the evaluation level of expansion is judged It is extremely weak micro-expansion (level 6) or weak micro-expansion (level 5). At this time, the parameter of expansion influence depth in the expansion evaluation height influence parameters can be adjusted. Specifically, it is necessary to use the above-mentioned standard expansion amount as the current expansion evaluation height, and use the expansion height evaluation calculation formula to calculate the corresponding standard value of the expansion influence depth according to the currently calculated mixture expansion rate, and use this standard value as an update The post dilation affects the depth parameter. Further, according to the updated expansion influence depth value, the filling height of the actual engineering subgrade structure is adjusted so that the final expansion evaluation height is less than the standard expansion amount. In addition, it is also possible to implement measures to reduce the heat exchange between the external atmosphere and the interior of the bed, so as to realize the control of the depth parameter affected by expansion.
(第二个示例)当计算出的当前混合料膨胀率为中下微膨胀(4级)或中上微膨胀(3级)时，混合型填料自身的膨胀率属中等，(当前)膨胀性评价等级则判断为中下微膨胀(4级)或中上微膨胀(3级)，此时，可以通过以下任意一种或多种方式完成膨胀评价高度参数的调节。其一，根据现场实际情况按照上述方法调整膨胀影响深度参数。其二，选取任意个包括混合料压实后的反弹系数、细颗粒填充料含量、混合型填料含水率和混合型填料密度等混合料膨胀率影响参数进行调整。需要说明的是，在本例中混合料压实后的反弹系数、细颗粒填充料含量、混合型填料含水率和混合型填料密度仅为混合料膨胀率影响参数的具体示例，本领域技术人员可根据实际需求调整混合料膨胀率计算模型中能够影响膨胀率计算结果的任一参数，本申请对能够影响混合料膨胀率的参数不作具体限定。其三，通过向混合型填料中撒盐等水分迁移措施，通过盐分改变水与土粒子之间的相互作用，达到使土体中水分迁移强度发生变化，降低膨胀率。其四，适当调整基床结构，如增设排水设施等。下面针对各个膨胀率影响参数进行调整的方法进行具体说明：(Second example) When the calculated current expansion rate of the mixture is middle-lower micro-expansion (level 4) or upper-middle micro-expansion (level 3), the expansion rate of the mixed filler itself is medium, and the (current) expansion The evaluation level is judged as middle-lower micro-expansion (level 4) or upper-middle micro-expansion (level 3). At this time, the adjustment of the expansion evaluation height parameter can be completed by any one or more of the following methods. First, according to the actual situation on site, adjust the parameters of the depth of expansion influence according to the above method. Second, any parameter affecting the expansion rate of the mixture, including the rebound coefficient after compaction of the mixture, the content of fine particle filler, the moisture content of the mixed filler, and the density of the mixed filler, is selected for adjustment. It should be noted that in this example, the coefficient of rebound after compaction of the mixture, the content of fine particle filler, the moisture content of the mixed filler and the density of the mixed filler are only specific examples of the parameters affecting the expansion rate of the mixture. Those skilled in the art Any parameter that can affect the calculation result of the expansion rate in the calculation model of the expansion rate of the mixture can be adjusted according to actual needs, and the present application does not specifically limit the parameters that can affect the expansion rate of the mixture. Third, through water migration measures such as sprinkling salt into the mixed filler, the interaction between water and soil particles can be changed through salt, so as to change the water migration strength in the soil and reduce the expansion rate. Fourth, properly adjust the foundation bed structure, such as adding drainage facilities. The following is a specific description of the method of adjusting the parameters affecting each expansion rate:
第一，调整混合料反弹系数：基于混合料压实后的弹性形变状态，通过室内压实试验，选取反弹系数较小的混合料，将变化后的参数值重新代入混合料膨胀率计算模型中，得到更新后的膨胀率，直至膨胀率减小至对应等级的允许的膨胀率范围之内，直至膨胀评价高度小于标准膨胀量。First, adjust the rebound coefficient of the mixture: based on the elastic deformation state of the mixture after compaction, through the indoor compaction test, select the mixture with a smaller rebound coefficient, and resubstitute the changed parameter values into the calculation model of the mixture expansion rate , to obtain the updated expansion rate, until the expansion rate decreases to within the allowable expansion rate range of the corresponding grade, until the expansion evaluation height is less than the standard expansion amount.
第二，调整混合料含水率：按一定比例逐次降低混合料的含水率，相应降低细颗粒填充料膨胀率，将变化后的参数值重新代入混合料膨胀率计算模型中，得到更新后的膨胀率，并重新计算当前路段的膨胀评价高度，直至膨胀评价高度小于标准膨胀量范围之内。Second, adjust the moisture content of the mixture: gradually reduce the moisture content of the mixture according to a certain proportion, and correspondingly reduce the expansion rate of the fine particle filler, and resubstitute the changed parameter values into the calculation model of the expansion rate of the mixture to obtain the updated expansion rate. rate, and recalculate the expansion evaluation height of the current section until the expansion evaluation height is less than the standard expansion range.
第三，调整混合型填料密度：通过室内筛分实验，调整混合料的级配，逐次减小混合料级配不均匀度，增大填料孔隙率，相应减小混合型填料密度，将变化后的参数值重新代入混合料膨胀率计算模型中，直至膨胀率减小至相应膨胀评价高度允许的膨胀率范围之内。Third, adjust the density of the mixed filler: adjust the gradation of the mixture through the indoor screening experiment, gradually reduce the unevenness of the gradation of the mixture, increase the porosity of the filler, and reduce the density of the mixed filler accordingly. Resubstitute the parameter value of the mixture into the calculation model of the expansion rate of the mixture until the expansion rate is reduced to the allowable expansion rate range of the corresponding expansion evaluation height.
第四，调整细颗粒填充料含量：通过室内筛分实验，按比例减小细颗粒充填料含量，相应减小细颗粒填充料的充填率，将变化后的参数值重新代入混合料膨胀率计算模型中，直至得到满足标准膨胀量的膨胀评价高度。Fourth, adjust the content of fine-grain fillers: through indoor sieving experiments, reduce the content of fine-grain fillers in proportion, reduce the filling rate of fine-grain fillers accordingly, and resubstitute the changed parameter values into the calculation of the expansion rate of the mixture In the model, until the expansion evaluation height that meets the standard expansion amount is obtained.
(第三个示例)当计算出的当前混合料膨胀率为强微膨胀(2级)或极强微膨胀(1级)时，混合型填料自身的膨胀率较大，(当前)膨胀性评价等级则判断为强微膨胀(2级)或极强微膨胀(1级)，需要进一步完善如下一种或多种措施。第一，防止地下及地表水进入的基床隔水措施。第二，减少外部大气与基床内部进行热交换的基床保温措施。第三，采用基床抗形变相关措施，对路基结构进行优化，增强基床结构的抗形变能力。(Third example) When the calculated current expansion rate of the mixture is strong micro-expansion (level 2) or extremely strong micro-expansion (level 1), the expansion rate of the mixed filler itself is large, and the (current) expansion property evaluation The grade is judged as strong micro-expansion (level 2) or extremely strong micro-expansion (level 1), and one or more of the following measures need to be further improved. First, the foundation bed water isolation measures to prevent underground and surface water from entering. The second is to reduce the thermal insulation measures of the bed to reduce the heat exchange between the outside atmosphere and the inside of the bed. Thirdly, measures related to anti-deformation of the subgrade bed are adopted to optimize the subgrade structure and enhance the anti-deformation ability of the subgrade bed structure.
本发明提出了一种用于铁路路基工程的针对混合填充料的膨胀性评价方法，在完成对现有冻胀预测模型的修正后，构建了膨胀率预测模型，该方案提高了混合型填料膨胀性评价的完整性和准确性，同时基于已构建的膨胀性等级模型提出的膨胀性等级调整策略，为填筑工程的实施提供了具体地指导意义。The present invention proposes a method for evaluating the expansion of mixed filling materials used in railway subgrade engineering. After completing the correction of the existing frost heaving prediction model, the expansion rate prediction model is constructed. This scheme improves the expansion of mixed filling materials. The completeness and accuracy of the performance evaluation, and the adjustment strategy of the expansion grade based on the constructed expansion grade model provide specific guidance for the implementation of the reclamation project.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉该技术的人员在本发明所揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person familiar with the technology can easily think of changes or substitutions within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
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| CN114594044A (en) * | 2022-03-08 | 2022-06-07 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Evaluation and test method for erosion expansion of graded crushed stone mixed with cement aggregate |
| CN114594044B (en) * | 2022-03-08 | 2022-08-26 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Evaluation and test method for erosion expansion of graded crushed stone mixed with cement aggregate |
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